Beam.



No." 665,7!8. Patented m. a, mm;

H. .1. ARMSTRBNG.

BEAM.

(Application filed Mar. 18 1900.)

'(No Modal.)

WITNESSES UNITE STATES PATENT ()FFI E.

HERBERT JAMES ARMSTRONG, OF 1VI ARKDALE, CANADA.

BEAM.

SPECIFICATION formingpart of Letters Patent No. 665,718, dated- January 8, 1901.

' Application filed. March 16,1900. Serial 1%. 8,958. on model.)

To all whom it may concern.-

Be it known that I, HERBERT J-AMES ARM- STRONG, a subject of the Queen of Great Britain, and a resident of Markdale, in the Prov- .ince of Ontario and Dominion of Canada, have invented anew and Improved Beam, of which,

a full, clear, and exact de- This specification is the disclosure of one form of my invention, while the claims define the actual scope thereof.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate correspondingv parts in all the views.

Figure 1 is a sectional perspective view of the invention, the section being taken at the center of the beam. Fig. 2 is a fragmentary side elevation thereof; and Fig. 3 is a plan View, with parts in section, on the line 8 3 of Fig. 2.

The beam here shown is an I-beam comprising a web or body a, with flanges a at its 'top and bottom; but it is clear that the inven-- tion could be applied to beams of other form. According to the construction here shown the web of this beam is formed with an elliptical groove Z) therein, preferably striick up from the metal forming the beam and extending throughout the length of the beam, the middle of the groove. being situate at the bottom edge of the beam and the ends being at the top edge thereof. 'In this groove is placed a tube 0 of metal, shaped in conformity with the groove and fastened to the beam through the medium of flanges c, which may be welded or riveted to the beam, as desired. By forming the groove Z) in the beam and placing the tube ctherein the tube is situate with its longitudinal center coincident with that of the web a of the beam. 'lhis'tube forms one .chord of the truss,'as will'be understood. I

preferably employ a metallic tube; but it is clear that the chord formed of the tube could be constructed solid in the form of a bar, platefor the like;

Each end of the beam has the web turned back upon itself to form a hollow stanchion afisuch stanchions being situate,respectively, at the ends of the chord formed by the tube 0, so as to sustain the strain thereon. The

middle of the beam is provided with two ta.- pering metallic plates (1, the bases or body portions of which are riveted orotherwise fastened to the upper flange a of the beam and the apices of which extend downward into close proximity to the middle portion of the.

chord 0. These plates (1 are essentially in the form of longitudinally-divided conesand' have their edges secured to the web'of the beam, so as to constitute a strut for communicating the strain on the beam to the chord c and also for stiffening the web of the beam.

It is pointed out that the truss forms a component, though not necessarily integral, part of the web of the beam, and the extent of the v truss is therefore limited to the area of the beam. It is also pointed out that the beam thus co'nstructed is so thoroughly braced as to enable it to stand agreat deal more strain than the ordinary I-beam, since the truss formed in the beam communicates the strain to the ends thereof. By return-bending the ends of the web of the beam to form the stanchions a the beam is capable of bearing great strain at these points, to which points the strain of the truss is communicated and weight bearing on top of the beam is communicated to the strut formed by the plates (l, which in turn is borne by the chord c.

Having thus described my invention, I

claim as new and desire to secure by Letters Patentl. A\beam,having a Web, the ends of which are reinforced to forni stanchions, a trussehord forined on the Web and having its-ends anchored at the stanehions,and a strut formed at the middle of the web and communicating the strain to the chord.

2. A beam, having a metallic web with a '4. An I-beam, web thereof, and

situate at the middle 0 "side of the-web thereof, an i to communicate the groove and web; the

having 6. Abeam, sustained on the we Iout thelength of, the'beam,

havinga truss-ehord on the l a strut formed-of two plates 1": the beam one on each dfasten'ed thereto strain to the truss-chord, g a metallic web with a flanges fastened to the tube forming a truss-chord.

having a web, and a trusschord b and extending through-' the truss-chord extending into the central plane of the web; and the longitudinal axis of the truss-chord coinciding with the middle of the thickness as of the web;

In testimony whereof, I have signed my name to this speeifieation'in thepresenee of two subscribing witnesses.

HERBERT s mnsnnmsraone;

Witnesses:

' W, H. THEAKEB,

CHRISTINE .RICHARDSON. 

